Locking device



Feb. 13, 1962 e. HOFFMANN ,021,163

LOCKING DEVICE Filed May 15 1959 2 Sheets-Sheet 1 FIG. 2

FIG.1

Feb. 13, 1962 G. HOFFMANN LOCKING DEVICE 2 Sheets-Sheet 2 Filed May 15, 1959 FIG. 4

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FIG.5

FIG. 8

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Im/e7775r- Geov Aoffmann 77? hea United States Patent 3,021,1h3 Patented Feb. 13, 1962 [ice 3,021,163 LOCKING DEVICE George Hoffman, 19 Northcote Road, Hampstead, Quebec, Canada Filed May 15, 1959, Ser. No. 813,495 Claims priority, application Canada Apr. 2, 1959 1 Claim. (Cl. 292-147) This invention relates to window locking devices.

Heretofore, many proposals have been made to secure movable portions of windows together but the majority of these have either been of complicated design, thus increasing labour and assembly costs, or have not been too efiicient in preventing draughts entering and issuing from between said movable portions, or have not been too tamper-proof. Accordingly, it is the object of this invention to provide an improved window locking device which will overcome the above disadvantages and which will be relatively inexpensive to manufacture and assemble.

Accordingly, the present invention provides an improvement in a locking device for use on a window including a frame, an upper sash mounted in the upper part of said frame and a lower sash mounted in the lower part of said frame, the upper sash and the lower sash being slidably movable relative to one another, the locking device comprising in combination: a groove along the longitudinal axis of the upper rail of the lower sash; a latch slidable in said longitudinal groove, said latch including a projection extending laterally outwardly therefrom and including an enlarged head; a detent, secured to the bottom rail of the upper sash, said detent including a longitudinal slot having an enlarged closed end, adapted to engage said lateral projection of said latch and adapted to be in sliding, frictional, faceto-face engagement with said latch; and a spring, in the longitudinal groove of the upper rail of the lower sash, normally urging said latch upwardly and adapted, when said latch is slid into engagement with said detent, to maintain the enlarged head in frictional engagement with the enlarged closed end of said slot, to limit the movement of said latch away from the detent whereby to maintain the latch in a slot position and whereby said window is locked in its fully closed position.

The invention is illustrated in the accompanying drawings which show one embodiment of the invention.

In the drawings:

FIGURE 1 is a diagrammatic view of the locking device as shown when applied to the interior of a window;

FIGURE 2 is a front elevation of the upper and lower sashes of a window showing the locking device, the window being partially open;

FIGURE .3 is a transverse section taken on the line 3-3 of FIGURE 2;

FIGURE 4 is a similar view of FIGURE 2 but showing the window in closed position and the latch in operative condition;

FIGURE 5 is a transverse section taken on the line 5-5 of FIGURE 4;

FIGURE 6 is a perspective view of FIGURE 4;

FIGURES 7 and 8 are detail views of the latch portion of the locking device; and

FIGURE 9 is a detail View of the detent portion of the locking device.

Referring to the drawings, and in particular to FIG- URE 1, a window frame Iii is shown mounted in a wall 11 of a building. In the window shown, the frame as well as all the other structural components of the window, except those constituting the locking device, are formed from extruded aluminum except, of course, the glass window panes.

A lower sash 12 having a glass window pane 13 therein and an upper sash 14 having a similar glass window pane 15 therein, are both slidingly mounted within the frame 11. Each of the two sashes 12 and 14 are mounted in a manner which permits them to be moved from the top of the frame to the bottom of such, and vice versa, independently of one another. Both the sashes slide in planes substantially parallel with one another. A handle 16 on the lower sash 12 assists in raising and lowering the latter.

.When the lower sash 12 and the upper sash 14 are each in their closed position, the locking device, generally indicated at 17, maintains horizontal members 18, 19 of the two sashes 12, 14 respectively, in locked condition, said horizontal member 18 constituting a first window member and said horizontal member 19 constituting a second window member.

As will be seen from reference to FIGURES 4-6, when the sashes 12, 14 are in their closed position, their associated horizontal members 18, 19, respectively, are adapted to be in face-to-face physical contact with one another owing to the provision of interacting tongues 2d and grooves 21 therein. Each of the horizontal m embers 18, 19 are provided with a channel 22 adapted to receive the respective glass window pane 13, 15.

The upper edge of the horizontal member 18 is also provided with a guideway 23 (see FIGURES 3, 5 and 6) which is oppositely disposed to the channel 22 therein, and the side walls of said guideway 23 are each provided with an inwardly extending projection 24, the purpose of which will be described hereinafter.

Slidably mounted in the guideway 23 is the latch member 17 which is shown in greater detail in FIGURES 7 and 8. As will be seen from the drawings, each end of the latch member 17 is provided with a foot 25 which has a pair of shoulders 26 and a chamfered face 27 be seated. One side face of the latch member 17 is also tween which a bowed spring or resilient member 28 is provided with a projection 29 terminating, at one end thereof, in an enlarged head 30.

It will thus be apparent that when the latch member 17 is inserted into the guideway 23 of the first window member 18, the bowed spring 28 will contact the bottom of said guideway 23 and such contact permits the spring 28 to urge the upper surface of each pair of shoulders 26 of the feet 25 into contact with the underside of the inwardly extending projections 24 of the guideway 23. This also maintains the projection 29 and enlarged head 30. away from contact with the upper surface of the first window member 18. i

A pair of stops or rivets 31 extending between the side walls of the guideway 23 and between which the latch member 17 is slidably located, serve to limit the amount of movement of the latter in either direction. 7

As will be seen from reference to FIGURE 2, a prede termined amount of the tongue 20 and groove 21 in the first window member 18 is removed between the pair of rivets 31 so as to form a slot 32 in said member and the purpose of this slot will immediately become apparent. A predetermined amount of the tongue 20 and groove 21 in the second window member 19, is removed coincident with the slot 32 so as to form a housing for adeent 33 (see FIGURE 9) which is secured thereto by rivets 34.

As will be seen from the drawings, the detent 33 projects beyond the upper edge of the second window member 19 and is provided with a slot 35 which is open at one end and closed at the other, the closed end of said slot 35 terminating, in an enlargement or hook portion 36.

From the above description, it will be apparent that if the second window member 19 shown in FIGURE 2 is moved upwardly, the detent 33 will enter the slot 32 formed in the first window member 18 so that it projects beyond the coincident upper edges of both of said window members 18, 19. Concurrently, the tongues 20 and grooves 21 in the window members 18, 19 will engage with one another so that the adjacent side faces of the said window members will be in face-to-facc physical contact with one another.

It now the latch member 17 is slid towards the right, as viewed in FIGURE 2, enlarged head 39 of the projecticn 29 thereon will enter the slot 35 formed. in the detent 33. Due to the contact of the underside of the slot 35 with the enlarged head 39, the latch member 17 will be urged downwardly against the action of the bowed spring 28 until such time, and it the sliding movement of the latch member 17 is continued, that the'enlarged head 30 commences to enter the enlarged hook portion 36 of the slot 35. When the latter occurs, the bowed spring 28 will again exert itself and urge the entire latch member 17 upwardly so that the enlarged head 30 will be firmly located within said hook portion 3 6 of the slot 35. The two windows will be thereupon firmly locked together and relative movement therebetween will be prevented.

When it is desired to unlock the two window members 18, 19, finger pressure is brought to bear upon the upper members, it would be impossible to release the locking device, due to-the fact that in order to do so, downward and rearward movement must be imparted to said device.

edge of the latch member 17, which is serrated at 37 to'perniit easier manipulation, and the latch member 1 7 moved downwardly against the action of the bowed spring 28. This permits the enlarged head to be disengaged with the hook portion 36, whereby said latch member can be moved to the left, as viewed in FIG- URE 2, to permit unlocking of the components to occur, until further movement of said latch member is prevented by reason of the latch member 17 contacting the left-hand rivet 3i.

It will thus be appreciated that with the improved window locking device, a relatively tamper-proof window is provided inasmuch as the two window members are in face-to-face physical contact thereby preventing an instrument from'being inserted therebetween, as well as obviating the risk of draughts from entering.

Moreover, even if it was possible to insert an instrumentbetween the two contacting faces of the. window Although the invention is shown and described as applied to a window having both upper and lower sashes movable relatively to one another it will be appreciated that the locking device could be equally well applied to types of windows where only one of the sashes is movable .or where only one sash is provided in each frame.

I claim:

In a window locking device for use on a window including a frame, an upper sash mounted in the upper part of said frame, and a lower sash mounted in the lower part of said frame, the upper sash and the lower sash being slidably movable relative to one another, said locking device comprising in combination: a groove along the longitudinal axis ofthe upper rail of the lower sash; a latch slidable in said longitudinal groove, said latch including a projection laterally outwardly therefrom and including an enlarged head; a detent, secured to the bottom rail of the upper sash, said detent includ ing a longitudinal slot having an enlarged closed end, adapted to engage said lateral projection of said latch and adapted to be in sliding, frictional, face-to-face engagement with said latch; and a spring, in the longitudinal groove of the upper rail of the lower sash, normally urging said latch upwardly and adapted, when said latch is slid into engagement with said detent, to maintain the enlarged head {ill frictional engagement with the enlarged closed end of said slot, to limit the movement of the latch away from the detent, whereby to maintain the latch in its locked position whereby said window is locked in its fullyclosed position.

References Cited in the file of this patent U ITE TATE ATE "'T f 426,388 King Apr. 22, 1

' 1,432,640 Szah' Oct. 17, 1922 1,659,249 Entenmau Feb. 14, 1928 1,923,533 Foresman Aug. 22, 1933 

